Jenner, who turns 21 in August, is the youngest woman on the list, making her debut along with West. Forbes reports that Jenner has built a $900 million fortune in less than three years thanks in large part to her wildly popular makeup line, Kylie Cosmetics.

In contrast, Forbes pegs West’s net worth at $350 million.

Jenner and West have both built their empires by harnessing social media — Jenner has 110 million followers on Instagram.

The young mom of Stormi has sold $630 million worth of makeup since she launched Kylie Cosmetics in 2016, including an estimated $330 million in 2017, Forbes reports.

The magazine values her company at worth nearly $800 million — and Jenner owns 100 percent of it.

She also earns money from endorsements for brands like Puma and PacSun.

Forbes says she’s “conservatively worth $900 million,” and another year of growth will put her on track as not just the youngest female self-made billionaire ever, but the youngest self-made billionaire ever, period, beating out Mark Zuckerberg, who reached the billion-dollar mark at 23.

Forbes defines “self-made” as “any person who built her own fortune, and didn’t inherit the money.”

Jenner’s company only has seven full-time and five part-time employees.

She credited social media with her success. “I have such easy access to my fans and my customers,” she told Forbes.